docs: def Shift(self, value, copy=False):
          """
          Shift the graph left or right by value
          """
          numPoints = self.GetN()
          if copy:
              shiftGraph = self.Clone()
          else:
              shiftGraph = self
          X = self.GetX()
          EXlow = self.GetEXlow()
          EXhigh = self.GetEXhigh()
          Y = self.GetY()
          EYlow = self.GetEYlow()
          EYhigh = self.GetEYhigh()
          for i in range(numPoints):
              shiftGraph.SetPoint(i, X[i] + value, Y[i])
              shiftGraph.SetPointError(
                  i,
                  EXlow[i], EXhigh[i],
                  EYlow[i], EYhigh[i])
          return shiftGraph